Which three operations require undo data? (Choose three.)
A.
Flashing back a transaction
B.
Recovering a failed transaction
C.
Committing a transaction
D.
Changing a tablespace status from READ ONLY to READ WRITE
E.
Running a read-consistent query
Which three operations require undo data? (Choose three.)
Which three operations require undo data? (Choose three.)
A.
Flashing back a transaction
B.
Recovering a failed transaction
C.
Committing a transaction
D.
Changing a tablespace status from READ ONLY to READ WRITE
E.
Running a read-consistent query
I choose ABE